package com.atguigu.web;

import com.atguigu.pojo.Book;
import com.atguigu.pojo.Page;
import com.atguigu.service.BookService;
import com.atguigu.service.impl.BookServiceImpl;
import com.atguigu.utils.WebUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class ClientBookServlet extends BaseServlet {

    private BookService bookService = new BookServiceImpl();
    /**
     * 处理分页功能
     * @param req 请求
     * @param resp 响应
     * @throws ServletException servlet 异常
     * @throws IOException io 异常
     */
    protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("经过了前台的servlet程序");
        //1.获取请求的参数 pageNo 和 pageSize
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        //2.调用BookService.page(pageNo,pageSize):Page对象
        Page<Book> page = bookService.page(pageNo, pageSize);
        page.setUrl("client/clientBookServlet?action=page");
        //3.保存Page对象到Request域中
        req.setAttribute("page", page);
        //4.请求转发到pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/client/index.jsp").forward(req, resp);
    }

    /**
     * 处理分页功能
     * @param req 请求
     * @param resp 响应
     * @throws ServletException servlet 异常
     * @throws IOException io 异常
     */
    protected void pageByPrice(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数 pageNo 和 pageSize
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        int min = WebUtils.parseInt(req.getParameter("min"), 0);//最小价格
        int max = WebUtils.parseInt(req.getParameter("max"), Integer.MAX_VALUE);//最大价格

        //2.调用BookService.pageByPrice(pageNo,pageSize):Page对象
        Page<Book> page = bookService.pageByPrice(pageNo, pageSize, min, max);
        //解决分页条中不带价格区间的bug
        StringBuilder sb = new StringBuilder("client/clientBookServlet?action=pageByPrice");
        //如果有最小价格的参数，追加到分页条的地址参数中
        if (req.getParameter("min") != null) {
            sb.append("&min=").append(req.getParameter("min"));
        }
        //如果有最大价格的参数，追加到分页条的地址参数中
        if (req.getParameter("max") != null) {
            sb.append("&max=").append(req.getParameter("max"));
        }
        page.setUrl(sb.toString());
        //3.保存Page对象到Request域中
        req.setAttribute("page", page);
        //4.请求转发到pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/client/index.jsp").forward(req, resp);
    }
}
